JPH081932Y2 - Automotive air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an air conditioner for a vehicle that is not equipped with a cooling device.

(Prior Art) A conventional air conditioner for a vehicle is, for example, as disclosed in Japanese Utility Model Publication No. 54-31704, a first temperature-sensitive resistance element that senses the air temperature on the upstream side of a heater, and a representative inside the vehicle. A second temperature-sensitive resistance element for sensing the air temperature, a temperature setter, and an output signal of an amplifier having a feedback potentiometer interlocking with an air mix door for adjusting the heating ability on the input side, thereby increasing or decreasing the heating ability of the heater. And an output signal of a switching circuit having the feedback potentiometer and the signal of the first temperature-sensitive resistance element on its input side, the air outlet is switched. In this device, the outlet is switched depending on the temperature of the blown air, and when the temperature of the blown air becomes high, the heater mode is set.

(Problems to be Solved by the Invention) In some vehicles, an air conditioner does not have a compressor (cooling device) because it is an option. In such a case, if the air conditioner as described above is adopted, the temperature of the blown air is high especially in the summer when the blowout mode is automatic, and only the heater mode (foot blowout) is required instead of the vent mode (upward blowout). There was a flaw.

For this reason, the present invention enables a general user to use (set to vent mode in summer) even in a vehicle that is not equipped with an air conditioner (compressor). (EN) An air conditioner for a vehicle that performs automatic control of the season blowing mode as much as possible.

(Means for Solving the Problems) In order to solve the problems, the present invention, as shown in FIG. 1, is a means for setting the temperature in the passenger compartment, a signal relating to the set temperature in the passenger compartment, and a detected temperature in the passenger compartment. A total signal calculating means 400 for calculating a control signal of the air conditioner based on an environmental signal including at least a signal relating to the air conditioner, an automatic heater judging means 500 for judging whether or not a cooling means is installed, and the total signal calculating means. Cooling request state determination means 600 for determining whether it is a cooling request state from the obtained signal, and mix door target value determination for determining whether the target opening of the mix door calculated by the integrated signal calculation means is full cool Means 700, and blown air temperature determination means 900 for determining whether or not the temperature is not sensible even if blown out from the vent outlet
If the automatic heater determination means 500 is not equipped with a cooling means, and the cooling request state determination means 600 is in the cooling required state, the air mix door target value determination means 700
When it is determined that it is in a full cool condition, and when it is determined that the temperature of the blown air temperature determination means 900 is not sensible even if it blows out from the vent outlet, the control means 800 that sets the blowout mode to the vent mode. Consists of.

(Operation) Therefore, in a vehicle not equipped with a compressor, it is determined whether the overall signal is in the cooling request state,
Moreover, when it is determined that the target value of the mix door is full cool, the blowing mode will be forced to be switched to the vent mode, and the automatic control of the blowing mode will be performed by the general usage method of the user in the full season. .

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

In FIG. 2, the vehicle air conditioner is provided with an intake switching device 2 on the most upstream side of the air conditioning duct 1, and the intake switching device 2 switches the inside air and the outside air to a portion where an inside air inlet 3 and an outside air inlet 4 are separated. A door 5 is arranged, and a desired suction mode is obtained by operating the inside / outside air switching door 5 by an actuator 6 to select the air introduced into the air conditioning duct 1 between the inside air and the outside air.

The blower 7 blows air into the air-conditioning duct 1 and blows the air downstream, and an evaporator 8 (which is not in a cooling pipe and is not in a use state and is indicated by a dotted line) behind the blower 7. And a heater core 9 are provided. Further, in front of the heater core 9, there is an air mix door.
A heater core 9 is provided by adjusting the opening of the air mix door 10 with an actuator 11.
The amount of air passing through the heater core 9 and the amount of air bypassing the heater core 9 are changed, and as a result, the temperature of the blown air is controlled.

The downstream side of the air conditioning duct 1 is divided into a defrost outlet 12, a vent outlet 13 and a foot outlet 14 and opens into a vehicle compartment 15, and the mode doors 16a, 16 are provided at the divided portions.
b, 16c are provided, and a desired blowout mode can be obtained by operating the mode doors 16a, 16b, 16c with the actuator 17.

The actuators 6, 11, 17 and the motors of the blower 7 are controlled based on the output signals from the microcomputer 21 via the drive circuits 20a to 20d, respectively.
The microcomputer 21 is a well-known computer having a central processing unit (CPU), a read only memory (ROM), a random access memory (RAM), an input / output port (I / O), etc., which are not shown. Reference numeral 21 denotes an output signal from a vehicle interior temperature sensor 22 that detects the temperature (TR) in the vehicle interior, and an outside air temperature sensor 23 that detects an outside air temperature (TA).
Solar radiation sensor 2 which detects the output signal from the solar radiation and the amount of solar radiation (TS)
The output signal from 4 and the output signal from the mode sensor 25 provided on the upstream side of the heater core 9 are selected via the multiplexer (MPX) 30 and converted into digital signals via the A / D converter 31. Is entered.

Further, an output signal from the operation panel 33 is input to the microcomputer 21. On this operation panel 33, the display unit 33 controlled by the microcomputer 21 via the surface circuit 34, the AUTO switch 35 for setting all the air conditioners such as the blower 7 to the automatic control state, the blower 7 etc. are stopped. An OFF switch 36 for turning off the display 33, a diff switch 37 for setting the blowout mode to the defrost mode, and an intake switch 38 for switching the intake mode between the inside air introduction (REC) and the outside air introduction (FRESH). ,
Up-down switch 3 for setting the set temperature T _p in the passenger compartment
9a, 39b, a MODE switch 40 for switching the blowout mode in the order of vent, bilevel, and heat, and a fan switch 41 for setting the rotation speed of the blower 7 are provided below the display unit 33.

The display unit 33 shows the intake mode, the set temperature blowing mode, the blower speed, the intake switch 38, the up / down switches 39a and 39b, the mode switch 40, and the fan switch 4 respectively.
It is displayed above 1. The display of the inhalation mode is displayed by alternately lighting REC and FRESH, the set temperature is digitally displayed, and this display temperature can be changed by operating the up / down switches 39a and 39b.

The display of the blowout mode is performed by lighting the arrow of the airflow indicating the blowout mode in accordance with the blowout mode selected by the MODE switch 40. Further, the speed display of the blower is performed by digital display. When it is "0", the blower 7 is stopped, when it is "1", it is low speed, when it is "2", it is medium and low speed,
If it is "3", it indicates that it is rotating at medium to high speed, and if it is "4", it indicates that it is rotating at high speed.

When the AUTO switch 35 is turned on, "AUTO" is displayed on the upper part of the display unit 33, and the fan switch 41 and the MODE switch 4 are displayed.
“MANUAL” is displayed by operating 0.

In FIG. 3, a program for a vehicle which is not equipped with the above-mentioned compressor by the microcomputer 21 is described in a flow chart. This flowchart starts execution from step 99 when, for example, the AUTO switch 35 of the display unit 33 is pressed,
At 0, the signals are input from the various sensors, the signals of the setting devices are input at the next step 101, the process proceeds to step 102, and the total signal T which is the control signal of the air conditioner is calculated.

T = K ₁ · TR + K ₂ · TA + K ₃ · TS-K ₄ · T _set + C where K _{1 to} K ₄ are gains of each sensor or setting device, C is a correction term, TR is indoor temperature, TA is outside air temperature, TS is solar radiation,
T _set is a set temperature.

After the total signal T is obtained, the routine proceeds to the next step 103, where it is judged whether or not the compressor is installed, and if it is in the state where the compressor is not installed (auto heater state), the automatic operation is started from step 104. If the heater control is started and the compressor is installed (automatic air conditioner state), the normal blowout mode described below
Continue to 112.

In step 104, the intake switching device 2 is switched to outside air introduction, and in step 105, from the total signal T,
Whether the value is a cooling request state or not is determined depending on whether the value is positive or negative. If the cooling request state, the process proceeds to the next step 106,
If the air conditioner is not in a required state, it is possible to sufficiently cope with the situation even if the compressor is not installed.

In step 106, the temperature of the front surface of the heater (for example, the air temperature detected by the mode sensor 25, or the outside air temperature detected by the outside air temperature sensor 23 because the outside air introduction mode is set when this step is processed). Will be used instead)
Is compared with a predetermined temperature T ₁ (for example, around 25 ° C.), and if it is higher than that, it becomes uncomfortable if a large amount of hot air blows out, so the routine proceeds to step 108, where the air volume is regulated to a low speed, and if it is lower than that. Since it is a temperature at which you can feel it,
Proceeding to step 107, there is no regulation of the air volume.

When the execution of each of steps 107 and 108 is completed, the process proceeds to step 109 and the value stored in the ROM in advance and obtained from the control characteristic of the mix door (see FIG. 4) is the mix door target value in the FULL COOL state. Judged, FULL COOL
If it is determined that the state is in the state, the heater front surface temperature (for example, the air temperature detected by the mode sensor 25 or the outside air temperature detected by the outside air temperature sensor 23) is determined in step 110, and a predetermined temperature T ₂ (for example, If the temperature is lower than about 30 ° C.), it is better to have a vent wind for a better feeling, so the routine proceeds to step 111, where the outlet is controlled to the vent mode.
When the temperature of the heater front is higher than a predetermined temperature T ₂ is changed to the normal blowing mode control because the uncomfortable when vent mode.

If the mixed door target value is not in the FULL COOL state in step 109, it indicates that temperature control is possible without the cooler. In this case, the temperature is controlled by shifting to the normal blowout mode control 112. Is.

The normal blow-out mode control in step 112 is performed by the temperature after the evaporator (temperature of the sensor 25) and the mix door 10
It is calculated from the control characteristic (see FIG. 5) of the mix door stored in the ROM in advance by the value of the expected blowout temperature Tf obtained by the opening degree Θ _x of.

TF = TE + βΘ _x where TE is the temperature obtained by the sensor 25, Θ _x is the opening of the air mix door, and β is the gain.

After executing steps 111 and 112, the process proceeds to step 113, and this program ends.

(Effect of device) As described above, according to this device, even if the temperature control cannot be performed without the air conditioner in the summer, etc., the vent mode is set if the blowout temperature is not so uncomfortable, so that the head feel. The ring can be improved, and full season automatic control becomes possible.

[Brief description of drawings]

FIG. 1 is a functional block diagram of the present invention, FIG. 2 is a configuration diagram showing an embodiment of the present invention, FIG. 3 is a flowchart showing an example of control operation by a microcomputer, and FIG. 4 is a mixed door target. A characteristic diagram showing values and FIG. 5 are blowing mode switching characteristic diagrams. 400: total signal calculation means, 500: automatic heater determination means, 600: cooling required state determination means, 700: mixed door target value determination means, 800: control means.

Claims (1)

[Scope of utility model registration request] 1. A total signal calculating means for calculating a control signal of an air conditioner based on an environmental signal including at least a signal concerning a set temperature of a vehicle compartment and a signal concerning a detected temperature of the vehicle compartment, and a cooling means are not provided. Automatic heater determination means for determining whether or not, a cooling required state determination means for determining whether a cooling required state is obtained from the signal obtained by the comprehensive signal computing means, and a target opening of the mixed door obtained by computation by the comprehensive signal computing means. Target value determination means for determining whether the temperature is in a full cool, blow-out air temperature determination means for determining whether or not the temperature is not sensible even if blown out from the vent outlet, and the auto-heater determination means Is not equipped with cooling means, in the cooling request state by the cooling request state determination means,
If the mix door target value determination means determines that the temperature is full cool, and the blowout air temperature determination means determines that the temperature is not sensible even when blown out from the vent outlet, the blowout mode is vented. An air conditioner for an automobile, characterized by comprising control means for setting a mode.